Process for imaging image points of a video picture and associated apparatus
US6057964A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Feb 19, 1997 |
| Grant date | May 2, 2000 |
| Priority date | — |
| Expiry date | Feb 19, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/74
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a process for imaging image points of a video picture by means of a light bundle which is controlled in intensity with respect to the brightness of the image points and which is deflected and then projected onto a screen by a lens or a lens system, a variable focal length is provided for the lens, the lens system or a partial lens system of the lens system and an object-side focal point is maintained stationary when the focal length is varied. In an apparatus for imaging image points of a video picture on a screen, with a deflecting device which deflects a light bundle onto a screen for linewise and framewise raster-scanning, this light bundle being controlled in intensity with respect to the brightness of the image points, and with a lens or a lens system between the deflecting device and the screen, the lens, the lens system or a partial lens system of the lens system can be adjusted with respect to focal length, and a device is provided which maintains stationary an object-side focal point of the lens or partial lens system during adjustment of the focal length.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.